I haven't used BWG till now, trying it with Wolfenstein, and I'm not clear on how to toggle between "playable" and "screenshot" resolutions with the app. Do I need to type in the resolution values each time into BWG or can they be saved and toggled with a hotkey?

Pretty sure I didn't have to register when I did it - or at least the first purchase you make acts as your registration. Had to fill out a simple form saying which product I wanted, gave the usual details, was taken to a credit card processor and that was that. About as standard a process as it gets. Maybe they've changed it.